Request for Help – Flashing Della Minisplit WiFi Module (WBR3 on TCWBRCU1)

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#211 21597558 04 Jul 2025 16:25

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #211
21597558 04 Jul 2025 16:25

That's good to hear. Do you have any suggestions for potential improvements of this driver?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#212 21598454 05 Jul 2025 20:32

AbidingOhmsLaw AbidingOhmsLaw

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Post #212
21598454 05 Jul 2025 20:32

[postid:70523b0c94][/postid:70523b0c94] Not at this time, not with the driver anyway, hell the few issues I have are with the Della itself, the remotes are IR are only one way communication. OpenBeken and the Driver has been working awesomely and I can access all the needed functionality with the climate card is HA. I have not tried heat mode but would not expect any issues.
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#213 21628810 07 Aug 2025 21:34

Mushinronsha Mushinronsha

Level 2

Post #213

21628810 07 Aug 2025 21:34

Hello and first and foremost, thank you for the job well done on OpenBeken, I've been enjoying both the process of converting my IoT devices to OpenBeken, and freeing them from Tuya at the same time. After installing HA yesterday, I went ahead and flashed OpenBeken as well as configured MQTT for the first time for my WBR3 module controlled A/C unit. The reason I'm posting is I noticed that when using the remote control, the smart thermostat entity in HA doesn't update. I can use HA to turn the A/C on when it's off and it properly displays its state change after doing so. In RTL87X0C.local ip, the state of the A/C and its change via remote, are properly reflected. MQTT is also (99% sure, at least I hope so) correctly configured since it says that it's connected. These is the repeating portion I get from the device's log when it's off.


Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/CurrentTemperature/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/TargetTemperature/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/ACMode/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/FANMode/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/Buzzer/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/Display/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/SwingH/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/SwingV/get
Info:MQTT:Publishing val 26 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val off to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val 4 to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val fix_mid to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val fix_mid to AirwavePlus/SwingV/get retain=0

and this is what I get when it's on:


Info:MQTT:Publishing val 27 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val auto to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val 4 to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val fix_mid to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val fix_mid to AirwavePlus/SwingV/get retain=0
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/CurrentTemperature/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/TargetTemperature/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/ACMode/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/FANMode/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/Buzzer/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/Display/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/SwingH/get
Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic AirwavePlus/SwingV/get

both of the logs seem OK to me so hence my post asking for help.

Also, the only active flags are 10,29,37 and 51.

Again thank you all participating devs for the wonderful endeavor and congrats on the road so far. TIA for your time.

#214 21628822 07 Aug 2025 21:41

AbidingOhmsLaw AbidingOhmsLaw

Level 9

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Post #214
21628822 07 Aug 2025 21:41

Hmm, I have not had issue with the remote not setting the HA card, the only thing I have noticed is that the remote itself won't update when changing setting via the HA card. That is to be expected though as it only has 1-way IR communications. I did scare myself with that as I had turned on my unit with the remote and it was not blowing cool air, the remote was last used to set heat and when I turned on the unit with the remote it resent the heat settings.

If you change a setting using the remote, do you see that change coming across in the MQTT topic?
#215 21628960 08 Aug 2025 01:15

Mushinronsha Mushinronsha

Level 2

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Post #215
21628960 08 Aug 2025 01:15

Sorry for taking so long to reply, I'm in really deep as I didn't check any other modes after flashing WBR3 with OpenBeken's latest version 1.18.145 yesterday. I only tried and used Cooling and Fan Only modes since it's summer here in Greece.

AbidingOhmsLaw wrote:
I have not had issue with the remote not setting the HA card

It might be my mistake phrasing my problem incorrectly, no worries though - let me rephrase and also add some new information:

The problem I referred to in my previous post is that while it's off and I turn it on using the remote, the off>on state change is not reflected in HA.

At that point, pressing the MODE button on the remote control to go from

cooling > heating
cooling > fan only
fan only > cooling
fan only > heating
heating > cooling
heating > fan only

is reflected correctly in HomeAssistant. For reasons unknown, it now behaves correctly and updates HA when turned on using both the remote and OpenBeken's webserver. As far as HomeAssistant is concerned, using the remote to turn the unit off and on as well as switching to Cooling/Heating or Fan only modes work. Auto or Dry modes are not reflected in HomeAssistant, something understandable since I'm not presented with those options in HA - don't know/think they are implemented yet. Also, changing Fan modes (1-5, Mute, Turbo and Auto) appear to be working.

FWIW, using the remote, I can switch to Drying or Auto mode and that's reflected in OpenBeken's webserver. So all's well that ends well? No, my RTL87X0C doesn't thinks so.

To reiterate, the problem I spoke of in my first post -change in state from off to on using the remote- probably was some kind of a fluke - I guess it was resolved after I restarted the RTL87X0C module. Interestingly though, this endeavour led me to somethings I can only as bugs in OpenBeken's side.

OpenBeken's webserver updates correctly when cycling through all 5 different modes using the remote and and the 3 HomeAssistant is capable of setting, namely cooling, fan only and heating. What is wrong then?

Since I got into the process of finding out what works and what doesn't, I noticed that using the remote and cycling modes to auto or dry, doesn't reflect on HA. I tried to do the same thing from OpenBeken. If I understand it correctly it should be like this (correct me if I'm wrong anywhere)

ACMode:

off turns off the unit - works
1 cooling - works
2 drying - undetectable from HA - works
3 fan only - works
4 heating - works
5 Judging by the order which my remote can cycle modes, I'd expect 5 to set the mode to Auto, but for some reason I don't understand, number 5 sets the unit to Heat. Nevertheless, the command sent when selecting number 5 registers - I hear the confirmation beep and "Mode" under "SwingV" switches to Heat.

Now, for the more interesting part. Buttons Mute and Turbo in OpenBeken turn the unit off.

Auto It seems that Auto mode - not Fan Auto mode, can be set using the last ACMode button all the way to the right.

FWIW, as I previously said above, in OpenBeken's UI visible from RTL87X0C.local webserver, cycling modes using the remote works perfectly. Thus I can infer that the problem is in OpenBeken's webserver part. But in any case, the way the UI is right now, having buttons that control the fan speed and the ac mode in the same controller is confusing. IMHO I think it would be prefferable to have 2 modes: AC and Fan, the way it is in HomeAssistant.

Quote:
If you change a setting using the remote, do you see that change coming across in the MQTT topic?

Fan Modes with Cooling - It's really interesting to correlate "fan modes"

1 of 5

Quote:

Warn:EnergyMeter:Ok we got reply with mode 1, fan 1, turbo 0, mute 0
Warn:EnergyMeter:fan 01
Warn:EnergyMeter:mode 01
Info:MQTT:Publishing val 28 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val cool to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingV/get retain=0

2 of 5

Quote:

Warn:EnergyMeter:Ok we got reply with mode 1, fan 4, turbo 0, mute 0
Warn:EnergyMeter:fan 04
Warn:EnergyMeter:mode 01
Info:MQTT:Publishing val 28 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val cool to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val 2 to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingV/get retain=0

3 of 5

Quote:

Warn:EnergyMeter:Ok we got reply with mode 1, fan 2, turbo 0, mute 0
Warn:EnergyMeter:fan 02
Warn:EnergyMeter:mode 01
Info:MQTT:Publishing val 28 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val cool to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val 3 to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingV/get retain=0

4 of 5

Quote:

Warn:EnergyMeter:Ok we got reply with mode 1, fan 5, turbo 0, mute 0
Warn:EnergyMeter:fan 05
Warn:EnergyMeter:mode 01
Info:MQTT:Publishing val 28 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val cool to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val 4 to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingV/get retain=0

5 of 5

Quote:

Warn:EnergyMeter:Ok we got reply with mode 1, fan 3, turbo 0, mute 0
Warn:EnergyMeter:fan 03
Warn:EnergyMeter:mode 01
Info:MQTT:Publishing val 28 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val cool to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val 5 to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingV/get retain=0

Turbo

Quote:

Warn:EnergyMeter:Ok we got reply with mode 1, fan 3, turbo 1, mute 0
Warn:EnergyMeter:fan 03
Warn:EnergyMeter:mode 01
Info:MQTT:Publishing val 28 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val cool to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val turbo to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingV/get retain=0

Auto

Quote:

Warn:EnergyMeter:Ok we got reply with mode 1, fan 0, turbo 0, mute 0
Warn:EnergyMeter:fan 00
Warn:EnergyMeter:mode 01
Info:MQTT:Publishing val 28 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val cool to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val auto to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingV/get retain=0

Mute

Quote:

Warn:EnergyMeter:Ok we got reply with mode 1, fan 1, turbo 0, mute 1
Warn:EnergyMeter:fan 01
Warn:EnergyMeter:mode 01
Info:MQTT:Publishing val 28 to AirwavePlus/CurrentTemperature/get retain=0
Info:MQTT:Publishing val 26 to AirwavePlus/TargetTemperature/get retain=0
Info:MQTT:Publishing val cool to AirwavePlus/ACMode/get retain=0
Info:MQTT:Publishing val mute to AirwavePlus/FANMode/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Buzzer/get retain=0
Info:MQTT:Publishing val 1 to AirwavePlus/Display/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingH/get retain=0
Info:MQTT:Publishing val none to AirwavePlus/SwingV/get retain=0

I think something is very wrong with the way OpenBeken displays fanspeeds. I'm here for any further debugging if I can help it.

Edit to include MQTT portion of the logs. As you can see, MQTT correctly reflects changes, which except Dry and Auto ACModes, HomeAssistant can utilize. The problem is the fan values sent from ACModes-FanModes in OpenBeken's webserver, the use of the remote works fine.
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#216 21759103 23 Nov 2025 03:10

vietxtlife vietxtlife

Level 8

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Post #216
21759103 23 Nov 2025 03:10

Could you guys add one more function to make this perfect, please?
Would love to have option to control how much power the inverter uses and report to HA how much the inverter is using if possible. Thanks guys for all your hard work
The OEM firmware has options for GEN at 30%, 50%, and 80%.

Added after 9 [hours] 19 [minutes]:

@p.kaczmarek2 hi, first of all thank you for the great work that you guys did.. so i have a favor to ask, my mini split have a function call GEN, which control how much the inverter compressor allow to run so its could be more efficient. could you add GEN option to the driver, that would make it perfect. thank you
#217 21759561 23 Nov 2025 10:34

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #217
21759561 23 Nov 2025 10:34

Hey can you provide more info on how GEN works? I don't have this specific device at hand, but I can add a feature once you provide me generic information on why and how. Is the GEN included in the protocol?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#218 21759932 23 Nov 2025 15:41

vietxtlife vietxtlife

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Post #218
21759932 23 Nov 2025 15:41

>>21759561 Yes, it has the DPID of 120 energy 发电机模式 enum true off, L1, L2, L3. L1 is 30%, L2 is 50% and L3 is 80% of power consumption. I have the wbr3 desoldered and soldered in another one in its place flashed with OpenRTL87X0C_1.18.217.bin so can't show screenshot of how Tuya app displays the option.
Thank you for the very fast response
#219 21759943 23 Nov 2025 15:52

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #219
21759943 23 Nov 2025 15:52

So TuyaMCU? Not a custom protocol?

I am confused, because earlier in this topic we were working on custom protocol support?

Can you provide a detailed information and summary of the device you have, model name, photos, screenshots from store where it was bought, etc?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#220 21759944 23 Nov 2025 15:54

vietxtlife vietxtlife

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Post #220
21759944 23 Nov 2025 15:54

>>21759943 It has the same Tuya firmware, every function is exactly like what is shown here https://www.amazon.com/Optima-Inverter-Condit...r-Pre-Charged-Installation/dp/B0CTJDYYW2?th=1. I have flashed the firmware, so if you let me know which command to send in MQTT to get info I could do that.
#221 21759952 23 Nov 2025 16:02

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #221
21759952 23 Nov 2025 16:02

What did you flash? Is the basics working? Can you control it via OBK?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#222 21759995 23 Nov 2025 21:58

vietxtlife vietxtlife

Level 8
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Post #222
21759995 23 Nov 2025 21:58

>>21759952 Yes, everything works. Flash the new WBR3 w
ith OpenRTL87X0C_1.18.217.bin I still have the original WBR3 with stock firmware aside just in case

Added after 4 [hours] 49 [minutes]:

@p.kaczmarek2 i just dumped the stock firmware from the stock WBR3

Added after 19 [minutes]:

got schema from tuya api dont know if its helps

Attachments:

dellajson.txt (11.25 KB) You must be logged in to download this attachment.

della schema.txt (41.2 KB) You must be logged in to download this attachment.
#223 21760381 23 Nov 2025 22:26

divadiow divadiow

Level 38

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Post #223
21760381 23 Nov 2025 22:26

Code: Text
Log in, to see the code

= TCL USB Adapter Board for Export

Code: JSON
Log in, to see the code
#224 21760566 24 Nov 2025 09:24

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #224
21760566 24 Nov 2025 09:24

So in the end it looks like you are requesting for a feature to be added there:
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/src/driver/drv_tclAC.c
?

But we would need the packet syntax for that 120 energy 发电机模式 enum true off, L1, L2, L3. L1 is 30%, L2 is 50% and L3 is 80% of power consumption.... It's not TuyaMCU, in this case.

Do we know it?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#225 21760784 24 Nov 2025 13:34

vietxtlife vietxtlife

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Post #225
21760784 24 Nov 2025 13:34

That’s it, new features to be added — that’s exactly it. Sorry, my coding knowledge and IoT wizardry are very limited, next to none, so if you could show me how to get the syntax packets I will surely jump on it. Thank you for everyone's help
#226 21760841 24 Nov 2025 14:41

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home
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Post #226
21760841 24 Nov 2025 14:41

insmod wrote:
It seems your device is not a TuyaMCU, but using a custom protocol.
See https://github.com/adaasch/AC-hack
https://github.com/lNikazzzl/tcl_ac_esphome/tree/master

Well it sure doesn't look like this variable is known?

Or maybe...
You said:
Code: text Expand Select all Copy to clipboard
enum true off, L1, L2, L3. L1 is 30%, L2 is 50% and L3 is 80%

There are 4 options? Or 5 options?
I am asking because...
It says 0x0 is off and 0x04 is On, and if so, what is 0x1, 0x2, and 0x3?
Would it be possible that 0x1 is L1, 0x2 is L2, and 0x3 is L3 (80%)? And 0x4 is .... idk, L4 - 100%? I do not even what the "L" here means...

And in our SDK...

Those two bits are unnamed. Maybe we should try setting them?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#227 21760848 24 Nov 2025 14:49

vietxtlife vietxtlife

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Post #227
21760848 24 Nov 2025 14:49

>>21760841 I think there are only 4 options:
{
"mode": "rw",
"property": {
"range": [
"0",
"1",
"2",
"3"
],
"type": "enum"
},
"id": 119,
"type": "obj"
},
{
"mode": "rw",
"property": {
"range": [
"off",
"L1",
"L2",
"L3"
],
"type": "enum"
},
Ranging from off to L3, so I guess like you said 0x0 is "off", 0x1 is "L1" ...
#228 21760855 24 Nov 2025 14:58

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #228
21760855 24 Nov 2025 14:58

We can just try it and see if it works, but the question is, can you tell if it works, somehow? I don't know, is there a LCD on the device that will show this option?

Added after 16 [seconds]:

We can just try it and see if it works, but the question is, can you tell if it works, somehow? I don't know, is there a LCD on the device that will show this option?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#229 21760863 24 Nov 2025 15:08

vietxtlife vietxtlife

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Post #229
21760863 24 Nov 2025 15:08

Yes, in the Tuya app it's shown that which GEN option is currently in use. Also, in HA via Tuya there are selections to set GEN options for automation. As for right now, the stock WBR3 is not soldered to the USB module, so I can't get SS to show. Give me a few; I will desolder WBR3 and solder back the stock one and take SS.
#230 21760893 24 Nov 2025 15:40

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #230
21760893 24 Nov 2025 15:40

No, I asked, for device with OBK - if we set it in OBK, do you have a way to check if it has been set correctly.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#231 21760897 24 Nov 2025 15:45

vietxtlife vietxtlife

Level 8

Post #231

21760897 24 Nov 2025 15:45

You mean check via MQTT log?

Edit:
Like these? I'm sorry, I'm so bad with these, lol. I shouldn't even attempt to mod anything

Warn:EnergyMeter:Initial size: 61Warn:EnergyMeter:BB 01 00 04 37 04 00 14 85 00 80 00 00 00 00 00 00 69 03 88 00 00 00 00 00 00 00 00 00 00 69 FF 42 00 00 1E 1D 2C 00 00 C0 00 00 00 00 79 00 00 00 44 40 05 05 00 00 1A 00 00 00 00 22 Warn:EnergyMeter:Ok we got reply with mode 1, fan 0, turbo 0, mute 0Warn:EnergyMeter:fan 00Warn:EnergyMeter:mode 04Info:MAIN:Time 83406, idle 0/s, free 51784, MQTT 1(327), bWifi 1, secondsWithNoPing -1, socks 2/21 Info:MQTT:MQTT client in mqtt_incoming_publish_cb topic bedroom_aircond/CurrentTemperature/getInfo:MQTT:MQTT client in mqtt_incoming_publish_cb topic bedroom_aircond/TargetTemperature/getInfo:MQTT:MQTT client in mqtt_incoming_publish_cb topic bedroom_aircond/ACMode/getInfo:MQTT:MQTT client in mqtt_incoming_publish_cb topic bedroom_aircond/FANMode/getInfo:MQTT:MQTT client in mqtt_incoming_publish_cb topic bedroom_aircond/Buzzer/getInfo:MQTT:MQTT client in mqtt_incoming_publish_cb topic bedroom_aircond/Display/getInfo:MQTT:MQTT client in mqtt_incoming_publish_cb topic bedroom_aircond/SwingH/getInfo:MQTT:MQTT client in mqtt_incoming_publish_cb topic bedroom_aircond/SwingV/getInfo:MQTTublishing val 21 to bedroom_aircond/CurrentTemperature/get retain=0Info:MQTTublishing val 21 to bedroom_aircond/TargetTemperature/get retain=0Info:MQTTublishing val heat to bedroom_aircond/ACMode/get retain=0Info:MQTTublishing val auto to bedroom_aircond/FANMode/get retain=0Info:MQTTublishing val 0 to bedroom_aircond/Buzzer/get retain=0Info:MQTTublishing val 0 to bedroom_aircond/Display/get retain=0Info:MQTTublishing val fix_right to bedroom_aircond/SwingH/get retain=0Info:MQTTublishing val fix_bottom to bedroom_aircond/SwingV/get retain=0Warn:EnergyMeter:Initial size: 61Warn:EnergyMeter:BB 01 00 04 37 04 00 14 85 00 80 00 00 00 00 00 00 69 03 88 00 00 00 00 00 00 00 00 00 00 69 FF 42 00 00 1E 1D 2C 00 00 C0 00 00 00 00 79 00 00 00 44 40 05 05 00 00 1A 00 00 00 00 22 Warn:EnergyMeter:Ok we got reply with mode 1, fan 0, turbo 0, mute 0Warn:EnergyMeter:fan 00Warn:EnergyMeter:mode 04Info:MAIN:Time 83407, idle 0/s, free 51784, MQTT 1(327), bWifi 1, secondsWithNoPing -1, socks 2/21

#232 21760951 24 Nov 2025 16:42

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #232
21760951 24 Nov 2025 16:42

No. I am not asking about OBK, I know OBK very well.

I am asking if there is a way to check this setting on device LCD or something. This is because, once we send it from OBK to the device, we need to be able to tell if the device has executed the command correctly or not...

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#233 21760959 24 Nov 2025 16:50

vietxtlife vietxtlife

Level 8

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Post #233
21760959 24 Nov 2025 16:50

>>21760951 The display on the unit does not change when this GEN option is engaged with the Tuya app, so I guess there won't be a way to tell if the command executed. Sorry. Maybe that is why this option was not supported in the first place lol. Still, your attempts are greatly appreciated
#234 21760967 24 Nov 2025 16:58

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #234
21760967 24 Nov 2025 16:58

Hmmm so there is no way to tell whether GEN option is working?

Well, I have a basic idea of what we can try to add it for you, but the question is, would you be able to give me feedback and tell whether it worked or not?

I don't know, maybe you can measure the power of the device, or check if it's louder or silent, I don't know, just guessing. I never seen that AC myself.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#235 21760969 24 Nov 2025 17:00

vietxtlife vietxtlife

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Post #235
21760969 24 Nov 2025 17:00

Through the Tuya app, whenever I engage the GEN option like L1, the power consumption drops sufficiently. I monitor power consumption via the inverters
#236 21760984 24 Nov 2025 17:13

divadiow divadiow

Level 38

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Post #236
21760984 24 Nov 2025 17:13

probably no help, but I got GPT to make this Python thing so the Tuya_Align_Della-048-TP-12K1V-22S-1_(schemaID-000001nbrw)_key73j3uh4c3dhqn_u9jjsaluqe1trtxv_TuyaMCU_WBR3_1.1.14.bin dump for this latest Della variant can finish booting and get into pairing mode.

still, dunno what the real MCU should respond with when sending these GEN options from the Tuya app.

Code: Python
Log in, to see the code

Does this paired device even look like yours @vietxtlife?
#237 21760993 24 Nov 2025 17:21

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #237
21760993 24 Nov 2025 17:21

Nice idea @divadiow , I would need to see packets send with multiple gen modes, where do they differ

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#238 21761050 24 Nov 2025 18:16

vietxtlife vietxtlife

Level 8

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Post #238
21761050 24 Nov 2025 18:16

>>21760984 Similar but not quite, though I think seeing how much power the unit consumes when each GEN option activates is adequate indicator; what you think? Maybe not precise enough but still an indicator
GEN options are the limit of how much the mini split will use as the options activate.
Added after 5 [minutes]:
#239 21761063 24 Nov 2025 18:19

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #239
21761063 24 Nov 2025 18:19

So basically I'll try to add option to change those two bits, you'll run it on your device, use it, and check if the power consumption changes?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#240 21761066 24 Nov 2025 18:21

vietxtlife vietxtlife

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Post #240
21761066 24 Nov 2025 18:21

>>21761063 Yes, yes, you just got the word out of my head, lol.
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Topic summary

✨ The discussion centers on flashing and customizing the WiFi module (WBR3 on TCWBRCU1 board) of a Della Optima Series minisplit air conditioner to run OpenBeken firmware for local, cloud-free control. Initial assumptions about the device using TuyaMCU were revised after UART traffic analysis revealed a custom protocol similar to TCL AC units, leading to the development and testing of a dedicated TCL driver in OpenBeken. The user successfully desoldered the WBR3 module, backed up its firmware using appropriate Realtek tools (ltchiptool and AmebaZ2 PG Tool), and flashed OpenBeken firmware. Key datapoints such as power, mode, fan speed, temperature, humidity, and PM2.5 were identified from the Tuya IoT platform, but the device uses a binary packet protocol rather than standard Tuya DPIDs.

The community collaboratively developed and refined the TCL driver, enabling control of power, mode (cool, heat, dry, fan, auto), fan speeds (mapped to Smart Life app presets including auto, mute, mid-low to turbo), swing positions (vertical and horizontal), buzzer (beep) on/off, and display brightness on/off. The driver was integrated with Home Assistant via MQTT with discovery support, allowing control and state feedback. Challenges included correct UART parity settings (even parity), packet parsing, and mapping driver values to Home Assistant entities. The user provided detailed logs, testing results, and UI feedback, leading to improvements in MQTT integration, UI elements for fan speed and swing controls, and bug fixes for state synchronization. The project also discussed future enhancements like better OBK UI integration, thermostat card improvements, and potential DIY thermostat projects using OBK on ESP32 with external sensors.

Overall, the thread documents a successful reverse engineering and firmware replacement effort for the Della minisplit WiFi module, enabling local control with OpenBeken, full MQTT/Home Assistant integration, and detailed community-driven driver development for a non-standard protocol device.

FAQ

TL;DR: Flash the Della TCWBRCU1/WBR3 Wi-Fi dongle over 3 V3 UART (9600 8E1) with AmebaZ2 PG Tool, then load the current OpenBeken build and start the new TCL driver to keep full HVAC control locally. Keep target temps between 16-31 °C (0-15 protocol value) and back up the 2 MB SPI flash first [Elektroda, dressyspider, post #21544728]

Quick Facts

• MCU / RF : Realtek RTL8710BN (AmebaZ2) on WBR3 [WBR3 Datasheet]
• Flash size: 2 MB (0x200000) dump confirmed [Elektroda, divadiow, post #21544743]
• UART port : 9600 bps, 8 data, **Even** parity, 1 stop [Elektroda, p.kaczmarek2, post #21550462]
• Protocol : 0xBB header, 61-byte TCL packet; temp field = (°C-16) (4 bits) [Elektroda, p.kaczmarek2, post #21552449]
• Product ID: klo4xmr94giahmug (Tuya Cat. kt) [Elektroda, dressyspider, post #21552194]

How do I back up the factory firmware before flashing?

Solder RX, TX, GND, 3 V3 and EN to the six WBR3 pads, short EN to GND, run AmebaZ2 PG Tool and click "Read Flash". The tool saves a 0x200000-byte BIN that can be restored later [Elektroda, divadiow, post #21544726]

Which OpenBeken binary should I upload?

Use the artefact file OpenRTL87X0C_x.xx.xx.bin from the latest CI build or PR #1650; upload with PG Tool’s "Write Flash" then reboot [Elektroda, p.kaczmarek2, post #21559301]

How do I start the new TCL driver?

After Wi-Fi connects, issue the command startDriver TCL. OBK adds runtime commands such as ACMode, TargetTemperature, FANMode, SwingH, SwingV, Buzzer and Display [Elektroda, p.kaczmarek2, post #21550113]

What ACMode numbers map to the unit’s modes?

0 = Off, 1 = Cool, 2 = Dry, 3 = Fan-only, 4 = Heat, 5 = Heat-Cool, 6 = Auto [Elektroda, p.kaczmarek2, post #21550217]

Why does TargetTemperature 75 show 81 °F on the wall unit?

OBK currently expects Celsius. Internally the packet stores (°C-16), so send 24 → 75 °F or 25 → 77 °F. The wall display uses Fahrenheit when DP 19 = “f” [Elektroda, p.kaczmarek2, post #21553236]

How can I silence the confirmation beep?

Run Buzzer 0 to clear the sound-bit; Buzzer 1 re-enables it. The command toggles bit 3 of byte 0x19 in the TCL packet [Elektroda, p.kaczmarek2, post #21559301]

Can I turn off the bright LED display?

Yes. Display 0 switches off the segment LEDs; Display 1 turns them on. Added in PR #1650 [Elektroda, p.kaczmarek2, post #21559501]

What fan-speed values are valid?

FANMode 0-7 follow Tuya list: 0-auto, 1-low, 2-mid-low, 3-mid, 4-mid-high, 5-high, 6-strong, 7-mute (extra-slow) [Elektroda, dressyspider, post #21536711]

How do I expose the AC in Home Assistant?

Enable MQTT in OBK, set topic prefix (e.g. "Mini Split"). OBK publishes • state → <prefix>/event/cooling/state • target temp → <prefix>/event/cooling/target Send commands to <prefix>/cmnd/TargetTemperature, ACMode, etc. Home Assistant’s MQTT Climate platform can map these fields [OpenBeken Docs].

Is the UART parity the same on replacement modules like WB3S?

Yes—Tuya WB3S, CB3S and TYWE3S break out the same 6-pin UART; all support 8E1 at 9600 bps when running OBK [Elektroda, p.kaczmarek2, post #21548807]

Can I still revert to Tuya Cloud after flashing?

If you saved the full 2 MB dump, write it back with PG Tool and re-pair in the Smart Life app. Keep the original WBR3 dongle as a fallback [Elektroda, dressyspider, post #21541593]

Does the driver read indoor and outdoor temperatures?

It currently parses DP 3 (indoor) and DP 23 (indoor°F). Outdoor sensor data isn’t exposed by the TCL MCU packet, so OBK cannot show it [Elektroda, p.kaczmarek2, post #21552449]

Where are the UART pins on the TCWBRCU1 board?

The six vias under the USB tongue map left-to-right to 3 V3, RX, TX, EN, IO0, GND. They align with A0, A1, A15 test pads shown in the teardown images [Elektroda, dressyspider, post #21536655]

What happens if I flash with wrong parity?

The module boots but the TCL MCU never recognises packets, so no relay, fan or temperature control respond [Elektroda, insmod, post #21550485]

Is there a risk of over-current on the 3 V3 rail?

The WBR3 draws approx. 120 mA peak during TX [WBR3 Datasheet]. A typical USB-A port on the indoor PCB can supply 500 mA, so flashing and runtime remain within safe limits.